diff --git a/CHANGELOG.md b/CHANGELOG.md
index cad120e..c867e00 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,15 @@
+# 1.6.0 (2016/03/03)
+
+## Feature
+
+- Add Masking API for UIWebView & WKWebView
+
+## Bug Fixes
+
+- Fix build warning when integrating the SDK
+- Reduce the possibility to upload duplicate session data
+- Reduce the possibility of crashing while masking
+
 # 1.5.1 (2016/02/21)
 
 ## Improvements
diff --git a/Repro.embeddedframework/Repro.framework/Headers/RPRUser.h b/Repro.embeddedframework/Repro.framework/Headers/RPRUser.h
deleted file mode 100644
index 43ccac4..0000000
--- a/Repro.embeddedframework/Repro.framework/Headers/RPRUser.h
+++ /dev/null
@@ -1,45 +0,0 @@
-//
-//  RPRUser.h
-//  Repro
-//
-//  Copyright © 2015 Repro Inc. All rights reserved.
-//
-
-#import <Foundation/Foundation.h>
-
-/**
- * Repro Public API: RPRUser
- */
-@interface RPRUser : NSObject
-
-@property (nonatomic, readonly) NSString *ID;
-@property (nonatomic, readonly) NSDictionary *profile;
-
-/**
- * @method
- *
- * @abstract
- * Setting a profile in Repro User.
- *
- * @discussion
- * key and value must be <code>NSString</code> objects
- *
- * @param value          profile value string
- * @param key            profile key string
- */
-- (void)setProfile:(NSString *)value forKey:(NSString *)key;
-
-/**
- * @method
- *
- * @abstract
- * Convenience method for setting profile information in Repro User.
- *
- * @discussion
- * Keys and values must be <code>NSString</code> objects
- *
- * @param profile        profile dictionary
- */
-- (void)setProfile:(NSDictionary *)profile;
-
-@end
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--- a/Repro.embeddedframework/Repro.framework/ReproSDKResources.bundle/repro.js
+++ b/Repro.embeddedframework/Repro.framework/ReproSDKResources.bundle/repro.js
@@ -1,43 +1,164 @@
-// Generated by CoffeeScript 1.10.0
 (function() {
-  var repro, track;
+  var getAbsoluteOffsetFromBody, getOS, mask, prevSensitiveElementData, repro, sendMessageToSDK, sensitiveElements, timerForMasking, track, unmask, watch, scalesPageToFit, parseMetaContent;
+
+  sensitiveElements = {};
+
+  prevSensitiveElementData = {};
+
+  timerForMasking = null;
 
   track = function(name, _props) {
-    var bridge, key, result, url, value;
-    if (typeof name !== 'string' || name === '') {
+    var data;
+    if (typeof name !== 'string' || name === '' || ((typeof _props !== 'object') && _props !== undefined)) {
       return;
     }
-    name = encodeURIComponent(name);
-    result = '';
-    if (typeof _props === 'object') {
-      for (key in _props) {
-        value = _props[key];
-        result += (encodeURIComponent(key)) + "=" + (encodeURIComponent(value)) + "&";
+    if (_props === null || _props === undefined) {
+      _props = {};
+    }
+    data = {
+      name: name,
+      properties: _props
+    };
+    return sendMessageToSDK('repro://track?data=' + JSON.stringify(data));
+  };
+
+  watch = function() {
+    var _e, _k, cur, data, offset, prev, fit;
+    if (Object.keys(sensitiveElements).length === 0) {
+      return;
+    }
+    data = [];
+    fit = scalesPageToFit();
+    for (_k in sensitiveElements) {
+      _e = sensitiveElements[_k];
+      offset = getAbsoluteOffsetFromBody(_e);
+      cur = {
+        x: offset.left,
+        y: offset.top,
+        w: _e.offsetWidth,
+        h: _e.offsetHeight,
+        key: _k,
+        ww: document.documentElement.clientWidth,
+        wh: document.documentElement.clientHeight,
+        fixed: (window.getComputedStyle(_e, null).position === "fixed"),
+        fit: fit
+      };
+      prev = prevSensitiveElementData[_k];
+      if (prev !== void 0 && prev !== null) {
+        if (cur.x === prev.x && cur.y === prev.y && cur.w === prev.w && cur.h === prev.h) {
+          continue;
+        }
       }
-      result = result.slice(0, result.length - 1);
+      data.push(cur);
+      prevSensitiveElementData[_k] = cur;
     }
-    if (result) {
-      url = 'repro://' + name + '?' + result;
-    } else {
-      url = 'repro://' + name;
+    if (Object.keys(data).length > 0) {
+      return sendMessageToSDK('repro://mask?data=' + JSON.stringify(data));
     }
-    bridge = document.getElementById('repro-insight-bridge');
-    if (bridge) {
-      return bridge.src = url;
+  };
+
+  mask = function(key, el) {
+    if (timerForMasking === null) {
+      timerForMasking = setInterval(watch, 50);
+    }
+    if (typeof key !== 'string' || key === '' || el === null) {
+      return;
+    }
+    return sensitiveElements[key] = el;
+  };
+
+  unmask = function(key) {
+    var data;
+    if (typeof key !== 'string' || key === '') {
+      return;
+    }
+    delete sensitiveElements[key];
+    delete prevSensitiveElementData[key];
+    data = {
+      key: key
+    };
+    return sendMessageToSDK('repro://unmask?data=' + JSON.stringify(data));
+  };
+
+  getAbsoluteOffsetFromBody = function(el) {
+    var _x, _y;
+    _x = 0;
+    _y = 0;
+    while (el && !isNaN(el.offsetLeft) && !isNaN(el.offsetTop)) {
+      _x += el.offsetLeft + el.clientLeft;
+      _y += el.offsetTop + el.clientTop;
+      el = el.offsetParent;
+    }
+    return {
+      top: _y,
+      left: _x
+    };
+  };
+
+  getOS = function() {
+    var userAgent;
+    userAgent = void 0;
+    userAgent = navigator.userAgent || navigator.vendor || window.opera;
+    if (userAgent.match(/iPad/i) || userAgent.match(/iPhone/i) || userAgent.match(/iPod/i)) {
+      return "iOS";
+    } else if (userAgent.match(/Android/i)) {
+      return "Android";
     } else {
-      bridge = document.createElement('iframe');
-      bridge.setAttribute('style', 'display:none;');
-      bridge.setAttribute('height', '0px');
-      bridge.setAttribute('width', '0px');
-      bridge.setAttribute('frameborder', '0');
-      bridge.setAttribute('id', 'repro-insight-bridge');
-      document.documentElement.appendChild(bridge);
-      return bridge.src = url;
+      return "unknown";
     }
   };
 
+  sendMessageToSDK = function(url) {
+    var bridge;
+    bridge = document.createElement('iframe');
+    bridge.setAttribute('style', 'display:none;');
+    bridge.setAttribute('height', '0px');
+    bridge.setAttribute('width', '0px');
+    bridge.setAttribute('frameborder', '0');
+    bridge.setAttribute('id', 'repro-sdk-bridge');
+    bridge.setAttribute('src', url);
+    document.documentElement.appendChild(bridge);
+    bridge.parentNode.removeChild(bridge);
+    return bridge = null;
+  };
+
+  scalesPageToFit = function() {
+    var metas, parsed;
+    metas = document.getElementsByTagName("meta");
+    for (var i = 0; i < metas.length; i++) {
+      if (metas[i].name === "viewport") {
+        parsed = parseMetaContent(metas[i].content);
+      }
+    }
+    if (parsed['width'] === 'device-width' &&
+        parsed['height'] === 'device-height' &&
+        parsed['initial-scale'] === '1.0' &&
+        parsed['maximum-scale'] === '1.0') {
+      return false;
+    }
+    return true;
+  }
+
+  parseMetaContent = function(str) {
+    var contents, parsed;
+    if (typeof str !== 'string') {
+      return null;
+    }
+    contents = str.split(',');
+    parsed = {};
+    for (var i = 0; i < contents.length; i++) {
+      var s = contents[i].trim().split("=");
+      if (s.length === 2) {
+        parsed[s[0]] = s[1];
+      }
+    }
+    return parsed;
+  }
+
   repro = {
-    track: track
+    track: track,
+    mask: mask,
+    unmask: unmask
   };
 
   window.repro = repro;
diff --git a/Repro.embeddedframework/Resources/ReproSDKResources.bundle b/Repro.embeddedframework/Resources/ReproSDKResources.bundle
deleted file mode 120000
index 7881ba2..0000000
--- a/Repro.embeddedframework/Resources/ReproSDKResources.bundle
+++ /dev/null
@@ -1 +0,0 @@
-../Repro.framework/ReproSDKResources.bundle
\ No newline at end of file
diff --git a/Repro.embeddedframework/Resources/ReproSDKResources.bundle/Info.plist b/Repro.embeddedframework/Resources/ReproSDKResources.bundle/Info.plist
new file mode 100644
index 0000000..381c4a1
Binary files /dev/null and b/Repro.embeddedframework/Resources/ReproSDKResources.bundle/Info.plist differ
diff --git a/Repro.embeddedframework/Resources/ReproSDKResources.bundle/repro.js b/Repro.embeddedframework/Resources/ReproSDKResources.bundle/repro.js
new file mode 100644
index 0000000..6357f24
--- /dev/null
+++ b/Repro.embeddedframework/Resources/ReproSDKResources.bundle/repro.js
@@ -0,0 +1,166 @@
+(function() {
+  var getAbsoluteOffsetFromBody, getOS, mask, prevSensitiveElementData, repro, sendMessageToSDK, sensitiveElements, timerForMasking, track, unmask, watch, scalesPageToFit, parseMetaContent;
+
+  sensitiveElements = {};
+
+  prevSensitiveElementData = {};
+
+  timerForMasking = null;
+
+  track = function(name, _props) {
+    var data;
+    if (typeof name !== 'string' || name === '' || ((typeof _props !== 'object') && _props !== undefined)) {
+      return;
+    }
+    if (_props === null || _props === undefined) {
+      _props = {};
+    }
+    data = {
+      name: name,
+      properties: _props
+    };
+    return sendMessageToSDK('repro://track?data=' + JSON.stringify(data));
+  };
+
+  watch = function() {
+    var _e, _k, cur, data, offset, prev, fit;
+    if (Object.keys(sensitiveElements).length === 0) {
+      return;
+    }
+    data = [];
+    fit = scalesPageToFit();
+    for (_k in sensitiveElements) {
+      _e = sensitiveElements[_k];
+      offset = getAbsoluteOffsetFromBody(_e);
+      cur = {
+        x: offset.left,
+        y: offset.top,
+        w: _e.offsetWidth,
+        h: _e.offsetHeight,
+        key: _k,
+        ww: document.documentElement.clientWidth,
+        wh: document.documentElement.clientHeight,
+        fixed: (window.getComputedStyle(_e, null).position === "fixed"),
+        fit: fit
+      };
+      prev = prevSensitiveElementData[_k];
+      if (prev !== void 0 && prev !== null) {
+        if (cur.x === prev.x && cur.y === prev.y && cur.w === prev.w && cur.h === prev.h) {
+          continue;
+        }
+      }
+      data.push(cur);
+      prevSensitiveElementData[_k] = cur;
+    }
+    if (Object.keys(data).length > 0) {
+      return sendMessageToSDK('repro://mask?data=' + JSON.stringify(data));
+    }
+  };
+
+  mask = function(key, el) {
+    if (timerForMasking === null) {
+      timerForMasking = setInterval(watch, 50);
+    }
+    if (typeof key !== 'string' || key === '' || el === null) {
+      return;
+    }
+    return sensitiveElements[key] = el;
+  };
+
+  unmask = function(key) {
+    var data;
+    if (typeof key !== 'string' || key === '') {
+      return;
+    }
+    delete sensitiveElements[key];
+    delete prevSensitiveElementData[key];
+    data = {
+      key: key
+    };
+    return sendMessageToSDK('repro://unmask?data=' + JSON.stringify(data));
+  };
+
+  getAbsoluteOffsetFromBody = function(el) {
+    var _x, _y;
+    _x = 0;
+    _y = 0;
+    while (el && !isNaN(el.offsetLeft) && !isNaN(el.offsetTop)) {
+      _x += el.offsetLeft + el.clientLeft;
+      _y += el.offsetTop + el.clientTop;
+      el = el.offsetParent;
+    }
+    return {
+      top: _y,
+      left: _x
+    };
+  };
+
+  getOS = function() {
+    var userAgent;
+    userAgent = void 0;
+    userAgent = navigator.userAgent || navigator.vendor || window.opera;
+    if (userAgent.match(/iPad/i) || userAgent.match(/iPhone/i) || userAgent.match(/iPod/i)) {
+      return "iOS";
+    } else if (userAgent.match(/Android/i)) {
+      return "Android";
+    } else {
+      return "unknown";
+    }
+  };
+
+  sendMessageToSDK = function(url) {
+    var bridge;
+    bridge = document.createElement('iframe');
+    bridge.setAttribute('style', 'display:none;');
+    bridge.setAttribute('height', '0px');
+    bridge.setAttribute('width', '0px');
+    bridge.setAttribute('frameborder', '0');
+    bridge.setAttribute('id', 'repro-sdk-bridge');
+    bridge.setAttribute('src', url);
+    document.documentElement.appendChild(bridge);
+    bridge.parentNode.removeChild(bridge);
+    return bridge = null;
+  };
+
+  scalesPageToFit = function() {
+    var metas, parsed;
+    metas = document.getElementsByTagName("meta");
+    for (var i = 0; i < metas.length; i++) {
+      if (metas[i].name === "viewport") {
+        parsed = parseMetaContent(metas[i].content);
+      }
+    }
+    if (parsed['width'] === 'device-width' &&
+        parsed['height'] === 'device-height' &&
+        parsed['initial-scale'] === '1.0' &&
+        parsed['maximum-scale'] === '1.0') {
+      return false;
+    }
+    return true;
+  }
+
+  parseMetaContent = function(str) {
+    var contents, parsed;
+    if (typeof str !== 'string') {
+      return null;
+    }
+    contents = str.split(',');
+    parsed = {};
+    for (var i = 0; i < contents.length; i++) {
+      var s = contents[i].trim().split("=");
+      if (s.length === 2) {
+        parsed[s[0]] = s[1];
+      }
+    }
+    return parsed;
+  }
+
+  repro = {
+    track: track,
+    mask: mask,
+    unmask: unmask
+  };
+
+  window.repro = repro;
+
+}).call(this);
diff --git a/Repro.embeddedframework/Resources/ReproSDKResources.bundle/repro_close_button.png b/Repro.embeddedframework/Resources/ReproSDKResources.bundle/repro_close_button.png
new file mode 100644
index 0000000..3b766f7
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diff --git a/Repro.embeddedframework/Resources/ReproSDKResources.bundle/repro_logo_transparent.png b/Repro.embeddedframework/Resources/ReproSDKResources.bundle/repro_logo_transparent.png
new file mode 100644
index 0000000..d2b4cba
Binary files /dev/null and b/Repro.embeddedframework/Resources/ReproSDKResources.bundle/repro_logo_transparent.png differ
diff --git a/Repro.embeddedframework/Resources/ReproSDKResources.bundle/repro_touch.png b/Repro.embeddedframework/Resources/ReproSDKResources.bundle/repro_touch.png
new file mode 100644
index 0000000..a7a5507
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diff --git a/Repro.embeddedframework/Resources/ReproSDKResources.bundle/repro_touch_landscape.png b/Repro.embeddedframework/Resources/ReproSDKResources.bundle/repro_touch_landscape.png
new file mode 100644
index 0000000..8d03ea7
Binary files /dev/null and b/Repro.embeddedframework/Resources/ReproSDKResources.bundle/repro_touch_landscape.png differ